mtd lawn tractor
 

recently swapped out a blown 12 horse engine for a used 12 horse. It workes
fine with the blade down, but it surges with the blade up. does anybody have
any ideas.

--
Rob in the U.S.A.
no matter where you go there you are

mtd lawn tractor
 

Rob Mcgee wrote:

recently swapped out a blown 12 horse engine for a used 12 horse. It workes
fine with the blade down, but it surges with the blade up. does anybody have
any ideas.

--
Rob in the U.S.A.
no matter where you go there you are

dont your engine maintenance/tune ups?

mtd lawn tractor
 

[posted and mailed]

" Rob Mcgee" wrote in
:

recently swapped out a blown 12 horse engine for a used 12 horse. It
workes fine with the blade down, but it surges with the blade up. does
anybody have any ideas.

--
Rob in the U.S.A.
no matter where you go there you are





Check that the blade belt is engaging and disengaging correctly.
With the blade down, the engine is under load. When you lift the
blade, it is supposed to turn the blade off, which would take the
load off the engine. If it is working correctly, then you probably
need to either adjust or clean the carb, or if it is a Tecumseh,
you may need to adjust the governor, as they can loosen up occasionally.

Matt
30 years in Outdoor Power Equipment repairs.

mtd lawn tractor
 

Check that the blade belt is engaging and disengaging correctly.
With the blade down, the engine is under load. When you lift the
blade, it is supposed to turn the blade off, which would take the
load off the engine. If it is working correctly, then you probably
need to either adjust or clean the carb, or if it is a Tecumseh,
you may need to adjust the governor, as they can loosen up occasionally.

Matt
30 years in Outdoor Power Equipment repairs.

the blade is disengageing or it wouldn't be trying to run on the idle
circuit which is obviously lean. a misadjusted governor would run too
fast or too slow.
start with the fuel system where the problem lies.
chip.